Process of Water Treatment
(1) pretreatment,

(2) pressurization,

(3) membrane separation, and

(4) post-treatment stabilization

Pretreatment:

The brackish feed water is pretreated to prevent fouling of the RO membranes by filtering suspended solids. The pH may be adjusted and adding a antiscalant added.
Pressurization:-

Electric pumps create the pressure needed to process the pretreated water effectively, according to the salinity of the feed water.
Separation:-

The RO membranes separate the fresh product water and the brine reject streams.
Stabilization:-

If post-treatment is required the permeate may be subject to pH adjustment and degasification.